Road maintenance machine



Aug. 16, 1932. J. s. MCCALLUM 1,871,542

ROAD MAINTENANCE MACHINE Filed Dec. 5,v 1928 3 Sheets-Sheet l 34 33 lll-wml F llllllllllhl t v l a cfm-3 A- lll l|||| NIMH v .Ei in ATTORN EY Aug. 16, 1932. J, 5, MGCALLUM ROAD MAINTENANCE MACHINE Filed Dec. 5, 1928 3 Sheets-Sheet 2 INVENTOR J, S. McCall/um' BY., r

ATTORNEY WITNESS @15.6 f'

` Allg 16, 1932 .1. s. MCCALLUM 1,871,542

ROAD MAINTENANCE MACHINE @f5.6 BY r ATTORNEY Patented Aug. 16, 1932 i JOHN S. MCALLUM, F GOLDFIELD, IOWAl ROAD MAIN'rnNANcEMAcHiNE l i Application flied recentere, 192e. seriaifnazazassa rllhis invention relates to a device for main'-y taining roads in condition.V Y v y An object of the invention is the provision of a device including a wheel supporting lbf frame adapted to be drawn over a roadbed in any ap roved manner and carrying an auxiliary rame which has universal vconnections with the main frame, a plowsupport being adjustably positioned transversely of 10 the'main frame. l

Av further object of the linvention is the provision of a road maintenance machine in which a `main frame is Vsupported by `wheels, an auxiliary frame being connected by a universal joint above and to the main frame, a ring supporting va plow having a greater diameter than the width of the main frame and adjustably positioned for varying the position of theplow, means being interposed betweenthe adjusting mechanism for ther plow and the ring to ,compensate for movement in the plow due to the variation in the surface of the roadbed. l

With the preceding and other objects and advantages in mind, the invention consists in the no velV combination of elements, constructions, arrangement ofparts, and operations to be hereinafter Vspecifically referred to, claimed and illustrated in the accompanying drawings, wherein:

Figure 1 .isa plan view of a device constructed in accordance with the principles of my invention,

Figure 2 is a longitudinal side view of the device, v Y' Figure 3 is a verticall section showing the connection between the main frame and the auxiliary frame,

Figure 4 is a. fragmentary view in perspective of a ring which supports the maintenance plow,

Figure 5'is a front end view in elevation of the device,

Figure 6 is a vertical section of a compensating' device interposed between the adjusting mechanism and the plow, Figure 7 is a transverse vertical section taken along the line 7-7 of Figure 1. e

Figure 8 is a 7fragmentary view in elevation of a rear frame, andv of construction.

are connected. at their' opposite ends to the Figure 9 isa perspective view'of a detail vvReferring more particularly to the drawings, 10r and 11 designate, respectively, the rear and front frames of the device. Y *i l55 Brace'bars l2 extend inwardly from the rear frame 1() and are connected to a bar 13 secured to the rI-beams 14 forming partof the structure of the auxiliary frame. v

VBrace bars 12 are connected at points ad- 60 jacent the outer edges ofthe rear frame 10 and are inclined inwardly towards each other. Brace bars 15 are secured at points to the bottom of the rear frame/10 and' extend upwardly and are connected, respec- 64.5VV

tively, to the beams 14 of the auxiliary frame. An axlel is'secured to the reariframe 10 and is provided with supporting wheels 17 A transverse bar 18 is secured to the underlfaces'oftlue`Ibeams 14l and brace bars 19 70 are connected with the front'frame 11 and to the underface of the bars 18, at points beneath the I-beams 14, f

Curved beams 20 have their opposite ends securedto the opposite ends of lthe'beams 75 14 and are braced intermediatetheir ends by standards21. Brace bars V22 'and 23 extend diagonally across the auxiliary frame and stems 21. Y Y Y 4 p 30 Diagcnally;disposedl brace bars 24 are secured to the top of the rear frame. 10and to the underface of an end bar 25 which has its opposite ends connected to the. rear ends of the .I-beams 14. A transverse bar 26 is 95 ksecuredto thefront endy of the T-beams 14.

Y Shafts 30r and 31 are mounted in bearings 32 in the l'front frame 1l and extend downwardly and each shaft isV provided'with an axle 33 on which is mounted awheel 34.V A 9 shaft 35 is mounted in bearings inthe front frame 11 to which is rigidly connected a dra-w bar 36. When the draw bar is rocked in opposite directions and vin a horizontal plane the shaft 35 will be rocked, thereby 95 rocking a gear 37 which is secured to a shaft 36. This gear meshesiwith a rack 38 secured toy a sliding bar 39. A rack 40 at oneend of therbar 39 meshes with a gear 41 which is rigidly secured to a shaft 30. A gear 42,

ing rotation, respectively, of the gears 41 beyond the front and 42. Rocking of the last-mentioned gears controls the steering ofthe wheels 34.

To facilitate the sliding movement yof the bar 39, rollers 44 are carried by links 45 and 10 engage the bar 39.

A ring 50 which has a diameter'lgreater than the width ofthe frame is supported below the auxiliary frame by means of cylin-fders 51 and piston rods 52. Each cylinder has a pair of perforated ears 53`which'receive. a pin54 carried by an ear 55. It will be noted that the ears 55 lare located atv diaanietrically opposite points on lthering 50.

Each cylinder has a rchamber 56 'in which is mounted a spring 57 having one end in engagement with theinner end of a hollow vpiston 58. The other end of the spring rests -upon .a .shoulder 59 at the bottomf of the chamber56. A disk 60 is secured to ya rod 61 and is normally disposed within the hollow piston 58'adjacent closed end 62 of said piston. The lower end of the rod 61 is threaded .atf'63 into the bottom of the cylinder 51. f The upper end of the cylinder is provided with slots 64`to receive the end of a bolt 65 which is secured in the hollow piston 58. The 'upperend ofthe hollow piston is secured, as shown at 66, to a pin 67, projecting from a gear-68 mounted rfor rotation on an Vaxle 69. The shaft 70 is mounted for rotation on the auxiliary frame and lhas a wormy 71 in mesh with a worm gear 68.'.A crank 7 2 projecting frame 11 is adaptedto be rotated for causing rotation of the worm vand gearl 68. It will be noted that thecylinders'l 51, together with thev corresponding elementsjust described are located at opposite sides ofthe rdevice and each is adjusted by its respective crank 72lor-72a. j

The cylinder 56 vis filled with a liquid such las oilv and v'to the level indicated at 73 so thatfthe liquid extends into a hollow piston 58; The closed end 62 of the piston 58 is l.provided withpassages 74 through which `the liquid may pass from thecliamber 56 to the hollow piston. Flap valves 75-control ,thepassages 74.` The disk 60is of kslightly less diameter than the diameter of the hollow Vpiston 58 Vso that liquid may pass around the piston 60 and enter the hollow piston 58.V

Aupair of bars kare secured at their forward ends to the frame 11 and extend rearwa-rdly overthe ring 50 andhave their rear ends pivoted at 81 to barsV 82-which in turn have their rear ends slidably mounted in .slots 83 of the rear frame. A bar 84 has its V fopposite ends secured to the ring 50 at points adjacent thezears 55. Abar -86 is Vsecured totli'efbars 8O as shown in Figure 7 and a pin forms a pivotal connection between the at the rear portion of the ring 50 for aiding in bracing the arcuately-shaped member 90 which supports the plow 88. The plow is curved and inclined at an angle to a vertical 'plane passingcentrally and transversely of the frame. 'A link 92 is provided with aplurality of perforations .193 adapted to receive a bolt 94 carried by the memberl 90 whereby the yinclination of the plow 88 Vmay be varied as desired.` Y .f j

Thefupper opposite corners of the front and rear frames j upstanding posts 95 carrying balls 96 which arere'ceived within sockets 97 formed of pairs of plates 98 and 99.V These socketsare riveted f at 100 tothe transverse bars 25 and 26.

vThe front ends of the bars 80 are secured to a plate 121 and this plate is providedwith an opening which will loosely receive the shaft 35. The free end of the plate is located 1i between the bearing 120 secured to the front end frame 11 and a collar 123 rigidly secured to the lower end of the Yshaft 35. Ears 122 project forwardly from the collar 123 and* these ears carry a vbolt 124 upon which the tongue 36 isY pivotally-mounted. j l

An opening in the plate121 where it is received bythe shaft 35 yis sufficiently large and the rcollar '123 is spaced a sufficientv `distance from the bearing 122 to permit a slight rocking of the platev121.` Y 7 Itwill be seen by this construction that the ring 5() may be tilted slightly to the horizontal due to the pivotal connection between the bars 80 and 82, the sliding connection of the bars 82 inthe openingsin the rear end frame 10- and-the loose mounting of the plate. 121 on the shaft 35. l It is important that the ring 50 be held Vas rigidly as possible so that the plow may not readily oscillatel during operation so that the plow will be maintained in a substantially rigid engagement with the roadbed in order to Yaccomplish the best results. f vThe operation of my'device is as follows: The cranks' 72 and 7 2" are adjusted in vorder to'properly position the plowl 88 with respect tothe roadbed as the device is drawn' over the roadbed and the plow 88, strikes an obstruction the pressure Vexerted against the 10 and 11 are providedwith 50. At this time of the plow or any of the parts connected to the plow.

When it is desired to Vtilt the plow transversely of the roadbed and at an angle to the horizontal the cranks 72 may be operated in reverse direction for causing elevation of one end of the plow while lowering the other. Since the ring- 50 is supported upon the pin 86. said pin will act as a pivot for the ring.

When the plow 88 is moved upwardly the rods 80 are likewise movedupwardly and due tothe pivotal connection at 81 with the rods 82 the rods 80 may be elevated with the ring the rods 82' slide through the bars 83V in the rear frame 10. The pivotal connections between the rods 80 and the Vfront frame 11 also provide for the oscillation of the said rods.

It will be noted that a main frame is pro vided and an auxiliary frame is mountedl upon the main frame b v ball and socket connections thereby providing a certain amount of play between the main frame and the auxiliary frame. The auxiliary frame has an over-head trussed arrangement for vreinforcing the auxiliary frame, the trussed section being connected to the longitudinally disposed I beams 14 at the opposite end of the trusses 2O and having a reinforced connection between the highest points of the trusses and the longitudinal beams 14C, thus the main frame is capable of adjusting itself to any uneven portions of a road bed.

The ring 50 may not only be partially rotated, but may be tilted at an angle to the horizontal for varying the positions of the plow 88. Thecylinder 51, piston 52 and the mechanism within the cylinder and piston will tend tomaintain the ring 50 and plow 88 in their adjusted position. Y

I claim:

A road maintenance machine comprising a frame, Wheels supporting the frame, a ring, a plow secured to the ring and disposed transversely of the frame, rods connecting the ring with one end of the frame, the other end of the frame having passages, rods having the outer ends received within the passages to provide a sliding' connection for the rods with said end ofthe frame, the last mentioned rods being pivotally connected'with the inner ends of the last-mentioned rods, and means for adjustably supporting the ,ring from the frame.

JOHN S. MGCALLUM. 

